Coordinate fuse and mounting clips



June 26, 1951 A. H. POWELL ET AL 2,558,581

COORDINATE FUSE AND MOUNTING CLIPS FiledAug. 12, 1948 Fig.3.

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Patented June 26, 1951 UNITED STATES PATENT OFFICE COORDINATE FUSE AND MOUNTING CLIPS Application August 12, 1948, Serial No. 43,916

1 Claim. 1

The invention relates to fuses, particularly special fuses such as may have a materially higher current interrupting rating than substantially the same size standard fuses so that any replacement of such high rated fuse by substituting a standard fuse in the fuse mounting clips for the high rated fuse might be quite dangerous.

The principal object is to provide a coordinate fuse terminal and spaced-apart mounting clip nesting construction that will effectively prevent substituting a standard fuse in place of the coordinate fuse upon a predetermined spacing of the fuse mounting clips.

Another object is to provide a coordinate fuse with mounting terminals at each end having a predetermined spacing as well as a special contour formed to nest with interference projections extending from a pair of fuse clips therefor in predetermined spaced-apart relation and provided with open channels extending therethrough in alignment to form fuse terminal mounting seats so that the special interference projections will prevent the seating of a standard fuse there- The invention will be more fully understood from the following description of the accompanying drawing in which Fig. 1 is a top view of a specially formed cylindrical end terminal cartridge fuse mounted in specially formed clamp fuse clips embodying the coordinate nesting fuse end terminal and clamp seating improvements of the present invention; Fig. 2 is an end view of the coordinate fuse and fuse clips shown in Fig. 1; Fig. 3 shows a modified form of the coordinate nesting fuse end terminal and clamp seating invention applied to a knife blade type of cartridge fuse and fuse clips therefor; and Fig.

'4 is an end view of the coordinate knife blade fuse and fuse clips shown in Fig. 3.

As shown in Fig. l, the cylindrical terminal cartridge fuse I0 is of a specially improved type having a higher current interrupting rating than substantially the same size standard fuse. In order to differentiate this special high rated fuse from the standard fuse, each of the cylindrical end terminals 1 I of fuse I0 is provided with a circumferential groove I2, preferably of semicircular cross section as shown. The coordinate pair of fuse mounting clips 13 are adapted to be mounted in standard spaced-apart alignment and each is provided with a semicylindrical open channel or mounting seat I 4 in alignment for mounting the aligned cylindrical end terminals ll of the fuse 10 therein. In accordance with the present invention, each semicylindrical channel or mounting seat 14 is provided with an inner projection 15 in the form of the headed rivet as shown for nesting in coordinate relation with the groove l2 in the terminal II when the fuse is mounted in the clips with a predetermined spacing therebetween. In order to hold the fuse terminal H in firm electrical engagement therewith, each clip is provided with a screw clamp l6 for wedging the corresponding fuse terminal firmly into the channel or seat [4 of the clip.

In case the special high rated fuse 10 should be subjected to sufiicient overload to burn out the fuse element so that a replacement of the fuse becomes necessary, then it is impossible to mount a standard cylindrical end terminal fuse in the pair of standard spaced-apart fuse clips I3 due to the fact that each of the inner projections I5 reduces the inside diameter of the semicylindrical seats [4 sufficiently to prevent the seating of the cylindrical end terminals of a standard fuse in the clips 13.

In the modified form of the invention shown in Fig. 3, the cartridge fuse 20 also is of the special high rated type, even of higher current carrying capacity than the fuse 10 shown in Fig. 1. In such case the fuse 20 is provided at each end with a terminal cap 21 having a knife blade extension 22 for mounting the fuse 20 in the coordinated pair of fuse clips 23 that are adapted to be mounted in standard spaced-apart alignment. Each of the fuse clips 23 is provided with an open channel seat 24 having an inclined wall 25 for abutting engagement with the knife blade mounting terminal 22 of the fuse. In order to clamp the fuse in its seated position on the clip, each clip is provided with a wedge member 26 actuated by screw 21 so as to wedge the blade 22 into firm conducting relation with the inclined wall 25. Each coordinated mounting clip 23 also is provided with a special interference projection 28 that extends laterally from the clip toward the fuse a sufficient distance to prevent the mounting of a standard fuse between the standard spaced-apart clips 23. Consequently, the special high rated fuse 20 has the terminal cups 2| thereof foreshortened so to to nest upon a standard spacing of clips 23 in coordinate interlocking relation between the offset special interference projections 28 without any blocking as would be the case with a standard fuse. If desired, the fuse 20 may also be provided with the interference projections 29 to insure the mounting of the coordinated fuse in the proper position in the fuse clips 23.

Hence, whenever the fuse 29 is subject to an overload sufficient to burn out the fusible element so as to require a replacement, it is imv possible to mount a standard knife terminal cartridge fuse in the seats 24 of the spaced-apart fuse clips 23 due to the fact that the offset lateral projections 28 extend into the space therebetween far enough to effectively; bar the mounting of the standard fuse in the remaining space between the projections 28.

What we claim as new and desire to secure by Letters Patent of the United States is:

In combination, a pair of current conductin fuse clips, each having an open channel extending therethrough to form a fuse terminal connection and mounting seat when the clips are mounted in a predetermined spaced-apart relation with the channels thereof in alignment, an interference projection extending inwardly from each clip for blocking the seating of the terminal of a fuse in coextensive current conducting engagement with the channel formed therein, and a coordinate fuse provided with a connection and mounting terminal at each end thereof in predetermined spaced-apart alignment and each terminal having a contour formed to nest with the interference projection on each of said clips only upon the seating of the coordinate fuse with the aligned end terminals of the fuse in coextensive current conducting engagement with the aligned channels of the clips.

ALRIC H. POWELL.

CARL L. SCHUCK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 850,836 Hornsby et a1 Apr. 16, 1907 946,251 7 Moffitt et a1 Jan. 11, 1910 1,475,257 Bottone Nov. 27, 1923 1,755,166 Cannon Apr. 22, 1930 1,851,249 Hammerly Mar. 29, 1932 2,194,667 Millermaster Mar. 26, 1940 FOREIGN PATENTS Number Country Date 17,213 Great Britain of 1906 

